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Old 08-04-2014, 10:45 PM   #1
skandero OP
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clutch slips after oil change...wtf?

Hi there,
My tricky Katoom gave me another brain-damage issue
Yesterday I've changed engine oil. And got clutch slip when the throttle is opened very agressive after 5-6k RPM... When I ride like an old man the clutch is not slipping, I open throttle fast and smooth - all is OK.
Performed the clutch test - slowly released the clutch, when the front brake is engaged: no slipping, the engine stalls at about 1/2 lever play.
... I ride 120 km/h / 5k rpm... opened the throttle hard - shit, the rpm jumps up to 6k for a second, then the bike accelerated as hell (exactly as I wanted to))
WTF? I use the same oil for years, bought from the official dealer. It's Motul 10w60 7100 fully synth MA2. Nothing was done, just oil/filter change (stock), screen and tank filter clearance - just as described in the maintenance manual. Oil level is exacly between min/max, not overfilled.
What is the root of the problem? All was fine before oil change. I rode ~70km on new oil. The previous oil ran for 6k km. Huh, the clutch plates and springs were changed together with the oil at previous service, so, they ran for 6k km too. The kit is EBC.

Googled the problem, but have not found any ideas, except bad oil or suddenly (!!) fried plates...
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Old 08-05-2014, 12:13 AM   #2
guglemonster
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the fried plates...
did you check the oil inlet screw? the one below the clutch slave? is it clean or blocked?

you may have disloged some dirt with the oil/filter change that blocked it and now the plates were running dry....

did you ope the clutch to check colour and oil sediments?

hope it's not as bad as it sounds

ciaps
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Old 08-05-2014, 12:46 AM   #3
skandero OP
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No, I have not open the clutch, because there were no symtoms before I changed the oil. But, maybe, I have to do this(
The clutch jet is clean. I check it and clean every time I change the oil...

It's interesting, that the slipping almost stops, when the engine gets hot enough. E.g. after riding in city traffic.
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Old 08-05-2014, 12:50 AM   #4
guglemonster
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are you sure it's not the master slave clutch joke?

did you bleed the system lately?

did you try using LHM mineral citroen air shocks oil (GREEN) instead of the clumsy magura blood?

it's much cheaper and in my opinion better for this application than the bloody expensive blood

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Old 08-05-2014, 12:50 AM   #5
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Quote:
Originally Posted by skandero View Post
No, I have not open the clutch, because there were no symtoms before I changed the oil. But, maybe, I have to do this(
The clutch jet is clean. I check it and clean every time I change the oil...

It's interesting, that the slipping almost stops, when the engine gets hot enough. E.g. after riding in city traffic.
worn basket ? burned springs? burned fibers ? needs some cheap rotella to work right?


I'd pull the clutch cover to find out, and get another gallon of rotella.
rotella.

subliminal :
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Old 08-05-2014, 03:27 AM   #6
skandero OP
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Yeah... My master cylinder is worn and will be replaced this week. But I can not figure, how can it cause the slip. Slow clutch release because of some air in the system? I use Shimano mineral oil in the clutch line... Feeling is nice...

As for the burnt clutch components... HOW? Two days ago all went well - no slipping at all. Changed the oil - and it failed. Why?!
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Old 08-05-2014, 03:43 AM   #7
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my own my

relax :)

if the sleave is worn it could get stuck while coming back, thus not releasing the pressure fast enough

once is hot, well tollerances go back to BIG and it goes better

resleave and get back on the road

shimano oil?? damn, you're all so rich around here??

haahhah

LHM mineral oil comes 5 euros the liter :) the rest must be much more expensive for sure haahhah

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guglemonster screwed with this post 08-05-2014 at 03:51 AM
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Old 08-05-2014, 04:53 AM   #8
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Thanks, man)
The master cylinder is completely worn and leaking... will get new one in couple of days, the old one would be resleeved.
Got Shimano from my friend, who bought it for about $28-30 per liter))) I paid nothing for 100 ml)
So, will check with new master and, maybe, recheck the oil jet...
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Old 08-05-2014, 05:17 AM   #9
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and get a cheaper oil haahhaah

really, it's mineral gunk..... citroen LHM, should be found also in some home depot, 5 bucks the liter is the right price for a good product

for 28 dollars per liter must be either Spanish or Italian good wine ahahh the rest is wasted green paper

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Old 08-07-2014, 01:08 PM   #10
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Thumb

ATF is cheaper
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Old 08-07-2014, 01:10 PM   #11
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I had the same thing happening to me with a bad master cylinder. It was scary because the RPM would increase like crazy.

I bought one from CJ and it is working like a champ (Oberon).

Carlos

Quote:
Originally Posted by skandero View Post
Thanks, man)
The master cylinder is completely worn and leaking... will get new one in couple of days, the old one would be resleeved.
Got Shimano from my friend, who bought it for about $28-30 per liter))) I paid nothing for 100 ml)
So, will check with new master and, maybe, recheck the oil jet...
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Old 08-07-2014, 10:25 PM   #12
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Yeehaa! Bled the system with LHM, replaced the piston... Master still leaking a bit, but the slip almost gone.
As I said, I'll replace the cyl, and it should be ok.
Thanks, guys.

BTW, I checked oil jet and plates - no problem there.
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Old 08-07-2014, 11:02 PM   #13
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ATF is cheaper
I think you should not use the ATF ..... unless you want to have lot's of surprises on the road

hahahaahah

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fuel "sock" filter for fuel cap

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Old 08-07-2014, 11:47 PM   #14
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ATF works without problems.
Are you thinking of brake fluid? That will damage the seals
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Old 08-08-2014, 12:10 AM   #15
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that's DOT....

here we tried ATF and the original o-ring was a bit worn out....

oh well, even better :) here the LHM is really cheap and we usually bleed every few months also to check level and oil status.....

we usually find it really black and more dense... like used up

the quantity is really small.... too little :)

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